Current Transformer (CT)
Learn how CTs work, what they’re used for, and how to install them safely in your systems.
Current transformer (CT) reduces high current to measurable range (5A or 1A). Enables safe metering of circuits >30A without high heat, large conductors.
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Electromagnetic induction principle. High current (primary winding) creates magnetic field. Secondary winding intercepts field, induces proportional lower current.
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Install CT in series with main power conductor, immediately upstream of breaker or downstream of utility meter. One CT per phase (3 CTs for three-phase).
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